Performing different computations conditioned on a column value in a spark dataframe

I have a pyspark dataframe with 2 columns, A and B. I need rows of B to be processed differently, based on values of the A column. In plain pandas I might do this: import pandas as pd funcDict = {} funcDict[‘f1’] = (lambda x:x+1000) funcDict[‘f2’] = (lambda x:x*x) df = pd.DataFrame([[‘a’,1],[‘b’,2],[‘b’,3],[‘a’,4]], columns=[‘A’,’B’]) df[‘newCol’] =…

Details

Difference between Container and ContainerBuilder?

Container It is a dependency injection container. It gives access to object instances (services).( Services and parameters are simple key/pair stores.) ContainerInterface set($id, $service) get($id, $invalid_behavior) has($id) getParameter($name) //what is parameter ??? hasParameter($name) setParameter($name, $value) ContainerBuilder It is a DI container that provides an API to easily describe services. So can we say that A…

Details

How to diagnose rasdaemon disk errors?

I recently installed rasdaemon which supersedes the deprecated mcelog. What do these “unknown block error” disk errors mean? $ ras-mc-ctl –errors No Memory errors. No PCIe AER errors. No Extlog errors. No devlink errors. Disk errors 1 2019-11-17 00:21:10 -0500 error: dev=0:2048, sector=2380583888, nr_sector=256, error=’unknown block error’, rwbs=’RA’, cmd=”, 2 2019-11-17 00:21:10 -0500 error: dev=0:2048,…

Details

Error when apt update and removing ppa

I am trying to test PHP 7.0 installation on vagrant using Ansible and get this error: TASK [php-cli : Install php7.0-cli package] ***************************************************************************** Thursday 21 November 2019 20:08:15 +0000 (0:00:00.034) 0:00:02.156 ***** fatal: [127.0.0.1]: FAILED! => {“changed”: false, “msg”: “Failed to update apt cache: W:Failed to fetch http://ppa.launchpad.net/ansible/ansible/ubuntu/dists/jessie/main/binary-amd64/Packages 404 Not Found [IP: 127.0.0.1]\n, E:Some index…

Details